Fire OS 7 software update version 7.2.7.3 with build value PS7273/2622, which prevents custom launcher use, is currently rolling out to the 2nd-gen Fire TV Cube, Fire TV Stick 4K Max, 3rd-gen Fire TV Stick, and Fire TV Stick Lite. The Fire OS 6 update that blocks customer launchers, which is rolling out to the Fire TV Stick 4K, 1st-gen Fire TV Cube, and 3rd-gen Fire TV (Pendant), is version 6.2.8.7 with build value PS6287/3768. – Elias Saba, AFTVnews » https://ift.tt/HFb0pYu